Oil-burner



0. J. GROEHN.

OIL BURNER.

APPLICATION FILED NOV. 2, 1918.

Patented Jan. 4,1921

'UNITED STATES PATENT OFFICE.

OTTO J. GROEI-IN, OF DETROIT, MICHIGAN, ASSIGN'OR T0 CLAYTON & LAMBERT MANU- FACTURING COMPANY, OF DETROIT, MICHIGAN, A. CORPORATION OF MICHIGAN.

OIL BURNER.

Specification of Letters Patent.

Patented Jan. 4, 1921.

Application filed'November 2, 1918. Serial No. 260,775.

T 0 all whom it may concern:

Be it known that I, O'r'ro J. GROEHN, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Oil- Burners, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to oil burners and more particularly to oil burners having provision for commingling air with the oil rior to combustion.

It is the object of the invention to provide in an oil burner a mixing device that will thoroughly atomize the oil and intimately commingle it with air, the construction being such as to avoid offering such resistance to the flow of fuel as would create appreciable back pressure.

In attaining this object the invention contemplates inserting in the burner pipe a sheet metal mixing device, which opposes a large number of thin edges to the oil and will tend to break the same up into small particles.

In the accompanying drawings:

Figure 1 is a view of the burner in side elevation; v

Fig. 2 is a longitudinal sectional view of the mixer portion of the burner;

Fig. 3 is a View of said portion in cross section on line 3-3 of. Fig. 2;

Fig. 4 is a detail View of one of the members, of which the mixer unit is built up.

In these views, the reference character 1 designates a pipe, one end of whichis connected through a reduced coupling 2 with a nozzle 3, while its other end is connected with an oil control valve 4. Slightly in advanceof said valve, anair supply pipe 5 connects with the pipe, the flow of air being controlled by a valve 6. To the intake side of the oil valve 4 a strainer 7 is connected, the oil being delivered thereto through a pipe 8. The outflow of oil from the valve 4 is through an elongated nozzle 9, extending centrally within the pipe 1 and spaced therefrom. The mounting of said nozzle is is effected by rigidly engaging its intake end in a bushin 10 fixedly secured within the extremity 0 the pipe 1 which engages the valve 4.

Within the pipe 1 intermediate the nozzles 3 and 9 there is positioned a device for thoroughly mixing the. oil escaping from the nozzle 9 with the air discharging from the passage surrounding said nozzle. This device comprises a series of elongated sheet metal strips 11 having longitudinal edges abutting and secured together at an axis to which all of said strips are transversely radial. Preferably an equiangular relation is maintained between the strips as may be best seen in Fig. 3, such a relation being permanently established by any suitable means as, for example, soldering or electric welding. The outer or free edges of the strips are similarly formed with series of recesses 12,'eacl1 terminating at one end in a square shoulder 13 and at the other in an inclined shoulder 14. Between the shoulders 14 the strips are twisted alternately in opposite directions, the effect being to shift said shoulders out of longitudinal registration. When positioned within the pipe 1, the device is arranged to cause the outfiowing mixture of oil and air to impinge against the inclined shoulders 13. Because of the twisted form of the strips 11, there is a slight angular differential between the successive shoulders 14, and the oil through successively impinging against these shoulders is thoroughly broken up and commingled in small particles with the air. By providing the strips with the recesses 12 and giving them the spiral form, the effective ness of each strip in atomizing the oil is multiplied by the number of recesses in the strip.

It is preferred to mount upon the nozzle 3 a hood 15 within the rear portion of which the nozzle discharges, said hood having an area considerably greater than that of the nozzle and being tapered toward its forward or discharge end. Said hood func- .tions to prevent undue spreading of the countered by the mixture and subdividing V the same.

2. In a device of the character described. the combination with a pipe, of means for effecting a flow of oil and air-through said pipe, anda sheet metal mixing device in said pipe having a plurality of thin edges radial to the axis of the pipe, successively encountered by the mixture and subdividing the same. 7

3. In a device of the character described. the combination with a pipe, of means for effecting a flow of oil and air through said pipe, and a mixing device comprising a strip of sheet metal twisted to form a spiral having its axis substantially at the center of said pipe, and formed with a plurality of radial shoulders encountered by the mixture.

4. In a device of the character described, the combination with a pipe, of means for effecting a flow of oil and air through said pipe, and a mixing device comprising a series of sheet metal strips having longitudinal edges abutting and secured together at the axis of the pipe, said strips radiating from said axis at various angles, each of the strips having a series of openings therein and being curved through a gradual spiral to angularly offset the edges of said openings successively encountered by the mixture.

5. In a device of the character described. the combination With a pipe, of means for effecting a flow of oil and air through said pipe, and a mixing device, comprising a series of sheet metal strips having longitudinal edges abutting and secured together at the axis of'the pipe, said strips radiating from the axis at various angles, each of said strips having a plurality of shoulders successively encountered by the mixture {to thoroughly commingle the components of said mixture.

6. In a device of the character described. the combination with a pipe, of means for effecting a flow of oil and air through said pipe, a mixing device comprising -a series of sheet metal strips having longitudinal edges abutting at the axis of the pipe, said strips radiating from said axis, each of said strips having a plurality of shoulders successively encoutered by the mixture, to thoroughly commingle the components of said mixture. e

In testimony whereof I affix my signature.

OTTO J. GROEHN. 

